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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions	Sep. 29, 2019 GBP (£) € / £ $ / £	Dec. 31, 2018 GBP (£) € / £ $ / £ Kč / £ $ / £
U.S. dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m		£ 4.8
U.S. dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £		1.2519
U.S. dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £		1.3419
U.S. dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 5.9	£ 7.5
U.S. dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £	1.2287	1.2609
U.S. dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £	1.2424	1.3380
Euros | Sales hedges
Derivative [Line Items]
Contract totals/£m	£ 3.6	£ 7.2
Euros | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1221	1.0949
Euros | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.1234	1.1702
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 0.8	£ 1.7
Exchange rates | € / £	1.1205
Euros | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £		1.1074
Euros | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £		1.1221
Canadian dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m	£ 5.9	£ 2.9
Canadian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.6213	1.7039
Canadian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.6476	1.7416
Czech koruna | Purchase hedges
Derivative [Line Items]
Contract totals/£m		£ 0.1
Exchange rates | Kč / £		28.4490

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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